High-speed vessel



Nv.825,193o; R. DEETJEN 1,782,888

f HIGH SPEED VESSEL uFiled Jan. 4. 192s Fig. '2, a plan view of Fig. 1,

Patented Nov. 25, 1930,

N Emtr-:Nr

" RroHARD DEETJEN@ diesennriirtwrnmnngsnoiin, GERMANY, Ass'ienon1 To "sinMtiNs y i 1 .a` QORPORATIO'N orf GERMANY SCHUCKERTWERKEAKTIENGESELLSCHAFT, oFJennnin-smivmussmnnr, aaninermi', l f

l Applicationled:January 4, 1929, Serial No.'330,"35fi,and` Germanyfllugust l2, i, i ,i Y

' My invention relates to improvements in high-speed vessels and its'` object is to reduce the friction losses and to increase "the stabil ity of thevessel, so thatV its speed is consid` .p erably increased and its seasworthiness greatly improved.

It has already been suggested to provide the bow or fore-body of boats `with eXtensions, bulges or swellings, which.` when the im boat dips intobig waves increase .the i`mine'rsed ships hold, andthus exert a statical-4 ly stabilizing action, which reduces the pitching of the boat. `It is, furthermore usual to provide adjacent to the edge of the ships side ledges 1or borders, which merely serve to catch the sprays and reduce the scouring of the outside planlring. It hasv also been proposed toprovide ledges, which extend comparatively steeply from the bow ofthe 5,20 boat to the bottom and which are intended to lift the bow of the boat ont of the water when travelling along.'

My invention consists of an equipment for high-speed boats, `whichconsists of ledges,

` borders or protrusions mounted at both sides ofthe outside planling above the water line in such a manner .that they are Within the reach of the bo`w-waves.

These ledges have a thin leading edge or a3@ are Wedge-shaped and preferably rounded on the underside where they abut against the outside planking. By theseledges the dy` namicforces of the bow wave are utilized for stabilizing the boat and at the same time 5 the friction losses fare greatly reduced, so

` that the speed of the boat increases consider- Y ably. i n

In the drawing affixedL hereto and forms ing part ofl my speciiication an embodiment of my invention is illustrated by way of example. v

The drawings showin Fig. l, a keel boat equipped with my im'- proved improvement in side-elevation,

Fig. 6, a "hydroplane the floats'of which a're'fequipped withthe ledges or" borders according torny invention;n

"Lilre parts are indicatedby like lettersjof the" boat is travelling at high Speed ahead-a bow-waveusually develops ofthe shape indif` cated @bythe b rolrenline.f Thislcauses coni siderablefriction alongfthe'ships body.' Since the boiv-wzwev rises beyondthe upper edge Vofthe boat sprays are driven into the i boat'peven when itis not particularly windy. Owing to the friction between the bow-wave and' the body of theboat the speedl ofthe boat isi-lconsiderably reduced, the jcrew-` is greatly molested lby the sprays blown into the boatandv the steering of the vessel `rendered'rdifficult.` "-"Byfmeans of `the ledges, borders orfthfe like `according to my invention the bowwave is caught-,its crests are `deflected `sideways and'lept from the boat. fThis results an increase ofthe speedfoftheboat due toV the reduction of the friction losses and `sprays `cannoo-longerenter thefboati f To promote the" tearin'g'oifofthe bow-wave the outer edges of the ledges ELare beyelled, while-,the innerfsides'are rounded off anidpreferablyjoin vtheb'od'y"oit theiboat in aparabolic curve; rear edges of the `borders flikei vvisel` terminate lin sharpV edges "to facilitate the tearingoif of the bow-waveV here also. 1 To avoid unnecessary*frictionlosses the ledges" areno't made broader thanf necessary for deiiecti'iig the blow-,wave laterally, "for in` stance' l/lQito 1/15 `of the Width` of the boat#l Thelower edges `of theborders atfthe" lowest point -lare preferably located" inches "above"` the water line; M Y i. i i "The ledgesfmay under ``certain` circumstances be subject to considerable strainsby the bow-wave. To increase its `strength andV topreventlwater from pressingonthe ledges fromthe top `vvhile'the boatisstationary or travelling at a slow speed, the ledges are preferably covered up by boards 3 extending up to the gunwale.

These novel ledges may easily be applied to existing boats. In the case of new boats they may be combined with the hull'into one unitary structure.

The ledges increase the stability of the boat considerably. Although they are located above the water line, the bow-wave forms a cushion of Water upon which the ledges rest securely. In this way the boat is prevented from rocking, and when the bow of the boat dips into a wave the bow is raised and flooding of the deck avoided. The ledges prove particularly effective when negotiating curves of small radii at full speed, because they prevent the boat tipping toward the outside and capsizing. The speed and sea-worthiness of the boat is thus considerably increased andit may be used under conditions under which it would otherwise be unable to cope with the Waves.

My invention is of particular value when Vapplied to the floats of hydro-airplanes. This application is illustrated in Fig. 6 in which such a float A is connected with the body of a hydro-airplane by stays 5. It is well known that when starting and landing hydro-airplanes glide on the water and attain a speed which may exceed nautical miles per hour. If such a plane equipped with floats of the hitherto customary construction is obliged to make an emergency landing on a rough sea it frequently happens that the floats are excessively retarded in consequence of the large friction losses, so that the hydroplane is overturned. l

This danger is avoided by equipping the floats of hydroplanes with side ledges or borders according to my invention, which defleet the bow-wave sideways. By this provision the friction losses of the floats are considerably decreased and the floats at thefsame t, time are supported in a way which counteracts the tipping tendency of the plane. lIt is furthermore possible to attain the necessary starting speed in a shorter time. I

Various modiflcationsvand changes may be made without departing from the spirit and the scope of the invention, and I desire, therefore, that only such limitations shall be placed thereon as are imposed by the prior art.

I claim as my invention:

l. In a high-speed vessel with convex hull, ledges with sharp outer edges, concave at the undersides and covered up at the top extending along the sides from near the middle of the vessel to the bow and so spaced from the water line that they are within reach of the bow-wave developed when going full speed ahead.

2. A hydro-airplane float comprising a vessel with convex hull, ledges with sharp outer edges, concave at-the undersdes and covered up at the top extending along the sides from near the middle of the vessel to the bow and so spaced from the water line that they are within reach of the bow-wave developed when going full speed ahead.

3. In a high-speed vessel with convex hull, a ledge concave at its underside and extending along each side of the vessel from near the middle of the hull to the bow, said ,ledges being so spaced above the water line that they are within reach of the bow-wave. developed when going full speed ahead.

In testimony whereof I affix my signature.

RICHARD DEETJEN. 

